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The Java Math nextAfter() method returns the floating-point number adjacent to the first argument in the direction of the second argument. If both arguments compare as equal a value equivalent to the second argument is returned. In special cases it returns the following:

  • If either argument is a NaN, then NaN is returned.
  • If both arguments are signed zeros, a value equivalent to direction is returned.
  • If start is infinite and direction has a value such that the result should have a smaller magnitude, Double.MAX_VALUE or Float.MAX_VALUE with the same sign as start is returned.
  • If start is ±Double.MIN_VALUE or ±Float.MIN_VALUE and direction has a value such that the result should have a smaller magnitude, then a zero with the same sign as start is returned.
  • If start is equal to ±Double.MAX_VALUE or ±Float.MAX_VALUE and direction has a value such that the result should have a larger magnitude, an infinity with same sign as start is returned.

Syntax

public static double nextAfter(double start, double direction)
public static float nextAfter(float start, double direction)

Parameters

start Specify starting floating-point value.
direction Specify value for direction.

Return Value

Returns the floating-point number adjacent to the first argument in the direction of the second argument.

Exception

NA.

Example:

In the below example, nextAfter() method returns the floating-point number adjacent to the first argument in the direction of the second argument.

public class MyClass {
 public static void main(String[] args) {
  System.out.println(Math.nextAfter(2.55, 4)); 
  System.out.println(Math.nextAfter(10.1, 3));   
 }
}

The output of the above code will be:

2.5500000000000003
10.099999999999998

❮ Java Math Methods